![To understand this radiation [ cosmic microwave background ], it is easier to begin thinking about the radiation from a very hot gas like that inside a neon light. The same neon... is, at room temperature, utterly transparent... The character of matter in general changes abruptly when it gets heated above 3,000 degrees or so. Below this temperature, matter is electrically neutral... At high temperatures in a neon light, the electrically charged pieces of atoms become unstuck. Frequent and violent collisions break down neutral atoms into electrons and unbalanced nuclei. Matter in this state is called plasma, and it radiates much of its collision energy in the form of light. ...a gas of neutral atoms (like air) is virtually transparent. The free [charged] nuclei and electrons of plasma, by contrast, couple to light's electromagnetic fields and absorb it very efficiently. ...You ...see light only from the borderline layer of neon between opaque plasma and transparent neutral atoms. (Frank Wilczek)](https://cdn.quotesdtb.com/img/quotes_images_webp/77/frank-wilczek-above-air-327977.webp)
To understand this radiation [ cosmic microwave background ], it is easier to begin thinking about the radiation from a very hot gas like that inside a neon light. The same neon... is, at room temperature, utterly transparent... The character of matter in general changes abruptly when it gets heated above 3,000 degrees or so. Below this temperature, matter is electrically neutral... At high temperatures in a neon light, the electrically charged pieces of atoms become unstuck. Frequent and violent collisions break down neutral atoms into electrons and unbalanced nuclei. Matter in this state is called plasma, and it radiates much of its collision energy in the form of light. ...a gas of neutral atoms (like air) is virtually transparent. The free [charged] nuclei and electrons of plasma, by contrast, couple to light's electromagnetic fields and absorb it very efficiently. ...You ...see light only from the borderline layer of neon between opaque plasma and transparent neutral atoms.
Frank WilczekRelated topics
above air background begin break character collision contrast couple easy energy form free frequent gas general high hot inside layer light matter neutral nucleus opaque plasma radiation room see state temperature thinking violent neon microwave borderline fieldsRelated quotes
Now, through my own infirmity I recover what he was to me: my opposite. Being naturally truthful, he did not see the point of these exaggerations, and was borne on by a natural sense of the fitting, was indeed a great master of the art of living so that he seems to have lived long, and to have spread calm round him, indifference one might almost say, certainly to his own advancement, save that he had also great compassion. [...] We have no ceremonies, only private dirges and no conclusions, only violent sensations, each separate. Nothing that has been said meets our case. [...] After a long lifetime, loosely, in a moment of revelation, I may lay hands on it, but now the idea breaks in my hand. Ideas break a thousand times for once that they globe themselves entire. [...] I am yawning. I am glutted with sensations. I am exhausted with the strain and the long, long time - twenty-five minutes, half an hour - that I have held myself alone outside the machine.
Virginia Woolf
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John Desmond Bernal
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Joseph Chamberlain
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Rosa Luxemburg
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Willa Cather
